Very few electric customers are served by more than one substation, that substation and the distribution wiring between the substation and the customer are goin

Very few electric customers are served by more than one substation, that substation and the distribution wiring between the substation and the customer are going to be a SPOF, except for the few customers with access to multiple substations. Some substations don't have redundant feeder power either, although that's more often the case where geography makes it difficult (islands/peninsulas)... But the mention of wiring on a bridge might be an indication that is a geographically difficult area of Berlin?